Device for dressing valve-seats.



i PATBNTBD 00T. 27,1903.

W. HAGSPIEL. DEVICE POR DRESSING VALVE'SEATS'.

APPLICATION FILED JUNE 7,190.2.

2 SHEETS-SHEET 1.

N0 MODEL.

No.A 742,313'.A Y PATENT-ED 06T; 2v, 190s'. W. HAGiSPIBL: DEVICE POR:DRBSSIEG VALVE SEACIS.y

A APPLIGAT'IQE FILED JUNE 7, 1902. No nonnL. a SHEETS-SHEET 2'.

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y Eye/faz? THE NOHmSJIETERs 0c.. PHOYOMTHQ. wAsmNcTo. me.

UNITED STATES( Patented October 2'?, 1903."

PATENT OFFICE.

WILHELM l-IAGSPIEL, OF LUDWIGSBURG, GERMANY, ASSIGNORTOAPPARATEBAUANISTALT LUDWIGSBURG G. M. B. H., OF LUDWIGS- BURG, GERMANY.

DEVICE FOR DRESSlNGVALV-SEATS.

SPECIFICATION forming partof VLetters Patent N o. 742,313, dated October2'?, 1903.

Application 'fied' Jane 7,1902. senti No. 110,662. (No man.)

To all whom it may concern: l

Be it known that I, WILHELM HAGsPIEL, a subject of the'Emperor ofGermany, residing at Ludwigsburg, Kingdom of Wrtemberg, in the Empire ofGermany, have `invented a new and useful rlool for Reseating Valves, ofwhich the following is a specification.

My invention relates to improvements in devices for cutting or millingvalve-seats having expanding jaws for engaging the internal surface ofthe valve-casing and for centering the device; and the objects of myimprovements are, first, to provide the expanding jaws withone orseveral sets of acute teeth; second, to provide a springer springs forautomatically-returning the jaws to their initial positions; third, toprovide a separate support for the spring or springs for the purpose ofpreventing them from falling off;

fourth, to provide arms-by means of which the device may be firmlysecured to flanged valve casings not providedA with V'screw-A threads;ifth, to providea springfor pressing the operating-spindlein thelongitudinal direction; sixth, to provide means for the adjustment ofthe operating-spindlein thelongitudinal direction; seventh, 'to soconstruct the operating-spindle as to render it reversif ble, so that itmay suit Vdifferent depths of valve-seats, and, eighth, to provideagrinding-holder furnished with adjustable means for clamping thevalve-stem, this holder being adapted to be secured to theoperatingspindle in place ofthe cutting or milling tool for the purposeof grinding the valveproper upon its seat.

In order to prevent any Adamage to the screw-threads of the valve-casingin applying my device thereto, I provide the expanding jaws of my devicewith the sets of acute teeth hereinafter described.V The acute teeth ofeach set correspond with a screw-thread of average diameterand pitchandengage in the screw-thread of the valve-casing, so that any damage tothe thread by the expanding jaw is avoided.

For hanged valve-casings having nol internal screw-threads, but smoothwalls, my device may be still used by means of its armsl 5o named above,while the expanding jaws serve for centering the device.

The device is illustrated in the accompany- .ing drawings,` in which-Figure 1 is an elevation, partly in section, of the device applied to avalve-Casin g with an internal screw-thread and arranged for cutting ormillingthe valve-seat. Fig. 2 is an elevation of'the device applied to aflanged valve-casing and arranged for grinding the valve upon its seat.Y Fig. 3 is au end view of the valve-stem gripper. v Fig. 4 is across-section of the devic'e on the line l 2in Fig. 2,

and Fig. 5 is an elevation of the operating` spindle with the handle anda cutting or milling tool.

Similar letters of reference refer to similar parts throughout theseveral views.

The casing a is provided at its lower end with three pairs of ears a/and three grooves for the expanding jaws b; further, with two'transverse arms h h, (which in Fig. 1 are omitted,) and, finally, witha threaded part, on which the nut d is arranged in a known manner to bescrewed up or down, as required. The expanding jaws b are pivoted onscrews c. On the upper oblique parts of these jaws the nutd bears whenscrewed down, and thereby moves the expanding jaws radially outwarduntil they press against the internal surface of the valve-casing bore.The lower part of each jaw b is in this instance .furnished with twosets of very acute teeth e Vof peculiar shape, which correspond in pitchwith different screw-threads of average diameter and pitch, and when thedevice is ap- 'plied to a valve having an internal screwthread (see Fig.l) these teeth e engage in the screw-thread r of lthe same. 0f coursethe expanding jaws b may have more than two sets of acute teeth,according to the diameters of the Valve-casings to which the 'device ist0 be adapted. By pivotally connecting the jaws with the casing andmaking the thread-engaging teeth very acute the tool is renderedthoroughly operative in cases where if the jaws had merely a .lateralmovement the teeth could not enter the grooves of the screw-thread, butwould impinge the crests thereof and tend to mutilate them. Thus in theevent that the tool is used on a valve-casing having threads ofdiiferent pitch than either of those of the sets of teeth on the jawsIool no danger of injuring the valve-threads will ensue, inasmuch as thepivotal arrangement of the jaws will permit the teeth to seat themselvesbetween the valve-threads, and the greater acuteness of the teeth ascompared with the valve-threads will allow the crests or points of theteeth firmly to impinge the wall of the threads, and thus hold the toolin operative position.

When the apparatus is inserted, the plane surfaces f between theuppermost teeth e and the expanding jaws and between the different teethrest on the turned upper part of the valve casing or body, and so insurethe true vertical adjustment ofthe device. Springs t' are provided forautomatically returning the expanding jaws ZJ to their initial positionon the nut d being loosened, so as to protect the internal screw threadof the valvecasing against damage.

In the case of flanged valve-casings the device is held steady by meansofthe transverse arms h, which are secured to the valve-flange byscrews, as shown in Fig. 2. In this case the teeth e of the expandingjaws b rest on the smooth bore s of the valve-casing and insure theexact central adjustment of the device.

In order to adapt the pressure of the cutting or milling tool or of thevalve proper to the hardness of the material to be cut or ground,respectively, the operating-spindle is subjected to the pressure of aspring. For this purpose the operating-spindle g is adapted not only toturn, but also to slide longitudinally in the casing a. It is providedwith a collarp, against which a spiral spring o, surrounding thespindle, is made to bear. The other end of this spring bears against asleeve m, which isintroduced into the casing a, and provided withhandles n for limiting its outward movement. Under the 4action of thisspring o the operatingspindle g is pressed downward, so that themilling-tool 7.a, Figs. l and 5, attached to its lower end, is enabledto perform its duty, or the valve itself may be ground properly upon itsseat, Fig. 2, when the spindle g is -turned by its handle Z, secured toits upper end. Y

The device is adapted to the grinding of the valve proper upon its seatby substituting for the milling or cutting tool 7.5 a holder orgripperfor carrying the valve. This holder or gripper is constructed asfollows: A piece or stud t is screw-threaded internally and eX- ternallyand formed with a conical end. This piece or studt is mounted on thescrew-threaded portion of the operating spindle g after the removal ofthe cutter 7c. Upon the external thread of the said piece or stud t isscrewed a ring u, which carries in suitable recesses pivotedgripping-jaws tu, adapted to firmly clamp the valve stem fy. These jaws,of which there may be two or more, are normally kept extended or spreadapart by a spring For tightening the gripping-jaws w upon 'masia thevalve-stem y vit is only necessary to screw the ring rttfarther on thepiece or stud t, thereby causing the tails of the jaws w to travel alongthe coned end of the said piece or stud, and so press the outer ends ofthe jaws firmly against the valve-stem y and retain it. The form of theouter ends of said jaws is such as to be capable of engaging valve-stemsof various sizes.

For adjusting the device to various depths of valve-seats the casing ais provided with two longitudinal slots a2 on opposite sides, having anumber of notchesg opening out of said slots. By this means the handlesn of the sleeve m can be adjusted to different heights and the tensionof the spiral spring o can be regulated. This adjustability of thespindle-pressure is of special advantage.

To obtain a greater facility and a wider range for this longitudinaladjustment of the operating-spindle g, the collarp of the latter is notarranged centrally, but is so disposed as to divide the spindle into twoportions of unequal lengths, and, moreover, the spindle g is madereversible. Then, according to the position or depth of the valve-seatin the interior of the valve-casing, the cutting or milling tool 7c orthe holder for the valve-stem can be attached to either the longer orthe shorter portion of the spindle g and the operating-handle Z to theopposite end thereof.

. In order to prevent the springs z' of the toothed jaws b from fallingout of their recesses when removing the spindle g, it is necessary tokeep said springs apart from the latter. To this end I provide anextension or neck a' on the lower end of the casing a to receive andsupport the spring or springs 7l. I may, however, provide a separatesleeve, ring, or the like for the purpose.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. A tool of the class described havingpivoted gripping-jaws, eachprovided with a plurality of very acute teeth of diderent pitch, therebyto adapt the tool for use in connection with screw threads havingdifferent pitches from those of the teeth.

2. In a milling device, a casing, a spindle in said casing, both ends ofsaid spindle being alike, adapting it to be reversed, a collar on saidspindle, located away from the longitudinal middle thereof, a springbearing at one end against said collar and at the other end against aportion of said casing, a milling-tool removably attached to one end ofsaid spindle, and operating means for said spindle removably attached tothe opposite end of said spindle.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

WILHELM I'IAGSPIEL.

Witnesses:

WM. HAHN, ERNST ENTENMAN.

IOO

I'IO

